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WAEC Mathematics 2002 Question 28

Question 28

Probability

A number is selected at random from the set Y = {18, 19, 20,...28, 29}. Find the probability that the number is prime

  1. A.1/4
  2. B.3/11
  3. C.1/2
  4. D.3/4
Show the answer and explanation

Answer: A (1/4)

Explanation

The set has 12 numbers; the primes are 19, 23 and 29. Probability = 3/12 = 1/4.